<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<script>
			var arr = [1, 2, 3, 4]
			// 5是数组的长度, 而不是数组中的存储数据
			var arr1 = new Array(5)
			console.log('arr, arr1 :>> ', arr, arr1)
		</script>
	</body>
</html>
